* feat: Implement preferredDuringSchedulingIgnoredDuringExecution for RemovePodsViolatingNodeAffinity
Now, the descheduler can detect and evict pods that are not optimally
allocated according to the "preferred..." node affinity. It only evicts
a pod if it can be scheduled on a node that scores higher in terms of
preferred node affinity than the current one.
This can be activated by enabling the RemovePodsViolatingNodeAffinity
plugin and passing "preferredDuringSchedulingIgnoredDuringExecution" in
the args.
For example, imagine we have a pod that prefers nodes with label "key1:
value1" with a weight of 10. If this pod is scheduled on a node that
doesn't have "key1: value1" as label but there's another node that has
this label and where this pod can potentially run, then the descheduler
will evict the pod.
Another effect of this commit is that the
RemovePodsViolatingNodeAffinity plugin will not remove pods that don't
fit in the current node but for other reasons than violating the node
affinity. Before that, enabling this plugin could cause evictions on
pods that were running on tainted nodes without the necessary
tolerations.
This commit also fixes the wording of some tests from
node_affinity_test.go and some parameters and expectations of these
tests, which were wrong.
* Optimization on RemovePodsViolatingNodeAffinity
Before checking if a pod can be evicted or if it can be scheduled
somewhere else, we first check if it has the corresponding nodeAffinity
field defined. Otherwise, the pod is automatically discarded as a
candidate.
Apart from that, the method that calculates the weight that a pod
gives to a node based on its preferred node affinity has been
renamed to better reflect what it does.
1. Enable OTEL configuration and base framework
2. update generated conversion spec
3. enable docker based conversion and deep copy generate
4. fix broken unit tests
* use pod informers for listing pods in removepodsviolatingtopologyspreadconstraint and removepodsviolatinginterpodantiaffinity
Signed-off-by: Amir Alavi <amiralavi7@gmail.com>
* workaround in topologyspreadconstraint test to ensure that informer's index returns pods sorted by name
---------
Signed-off-by: Amir Alavi <amiralavi7@gmail.com>
* pod anti-affinity check among nodes
* avoid pod equality check with UID field
also add node equality check with Name for short-cut
* add test case for anti-affinity violation among different node
* reduce ListPodsOnANode call
* fix old code
* apply gofumpt -w -extra
move klog/v2 import entry to bottom according to master code
* fix plugin arg conversion when using multiple profiles with same plugin
Signed-off-by: Amir Alavi <amiralavi7@gmail.com>
* PR feedback to refactor validateDeschedulerConfiguration error handling
---------
Signed-off-by: Amir Alavi <amiralavi7@gmail.com>
The Evict extension point is not currently in use.
All DefaultEvictor plugin functionality is exposed through Filter and
PreEvictionFilter extension points instead.
Thus, no need to limit the number of evictors enabled.
- Populate extension points automatically from plugin types
- Make a list of enabled extension points based on a profile
configuration
- Populate filter and pre-eviction filter handles from their
corresponding extension points
* Descheduling profile
* Fake plugin + profile unit testing
* Rename Profile config type into DeschedulerProfile
To avoid resamblance with profileImpl
* First run deschedule, then balance extension points
* add v1alpha2 registry based conversion
* test defaults, set our 1st explicit default
* fix typos and dates
* move pluginregistry to its own dir
* remove unused v1alpha2.Namespace type
* move migration code folders, remove switch
* validate internalPolicy a single time
* remove structured logs
* simplify return
* check for nil methods
* properly check before adding default evictor
* add TODO comment
* bump copyright year
